Question on VTF (What should i adjust it to?)

What is your cartridge model? 

Do yourself a favor...
As long as it's within the specs, enjoy your setup.

If you want something else to obsess about here's something
https://www.analogplanet.com/content/zenith-angle-correction-final-set-frontier
Another adjustment that gets yes and no answers.

If you hear mistracking on transients or complex musical passages, then tick up the VTF about a tenth of a gram.  Otherwise, what compels you to worry about it?  Also, what tool are you using to set VTF?  If you use the classic Shure SFG, it is not accurate within the range you are concerned to remain within (+/-0.15g), in my opinion.  To feel confident about differences in VTF of 0.1g, you will need a good digital scale specifically designed for vinyl, where the weigh pan is set down as close as possible to the veritable surface of an LP.  There are many available ranging in cost from ~$30 to more than $100.  The low cost ones tend to measure down to 0.1g. The higher cost ones tend to at least display down to .01g.  (Whether they are actually accurate below 0.1g is another matter.). Others like the "Riverstone", which is about the same price as a Shure SFG.

What are you talking about?

There is no cartridge that has a VTF as low as a .3 gram tracking force. You must be reading the instructions wrong!